Actuated Modular Mast for Confined Nuclear Dismantling
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Solution Overview
Problem
Existing nuclear installation dismantling systems face challenges with bulky single-piece masts that limit tool range and complex, imprecise hoist systems for modular masts, making them difficult to use and unsafe in cramped environments.
Innovation Solution
A dismantling system with a mast comprising two or more modules assembled together, using a handling system with a spreader and actuators to extend or shorten the mast by adding or removing modules, and a fixed part with fingers and stops for secure locking and guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-piece mast structure is used, then the structure is simple, but it becomes very bulky which makes its use difficult in cramped nuclear installations and reduces the tool's range of action
Solution Approach 1:
The mast is divided into multiple modular sections that can be assembled together. Each module has standardized connection interfaces allowing them to be joined securely. This segmentation enables the mast to be configured in different lengths and shapes to adapt to various spatial constraints within nuclear installations while maintaining structural integrity.
2Adaptability or versatility
If a mast is formed from several sections assembled together, then the adaptability increases, but there is no system for simply assembling these sections
Solution Approach 1:
Connection interfaces and locking mechanisms are pre-configured on each mast module during manufacturing. Alignment features and guide structures are built into the modules beforehand, enabling workers to assemble the mast by simply connecting pre-prepared interfaces without requiring complex alignment procedures or specialized tools.
3Length of moving object
If a hoist system is used to raise and lower the mast, then the mast can be extended, but the system becomes complex to operate and the hoist provides imprecise and unsafe positioning
Solution Approach 1:
The traditional hoist-based mechanical lifting system is replaced with an actuator system that provides controlled, precise movement. The actuators are integrated directly into the mast structure, eliminating the need for external hoists and complex cable systems. This substitution provides both precise positioning capability and simplified operation while maintaining the ability to extend and retract the mast.
4Length of moving object
If a hoist system is used to raise and lower the mast, then the mast can be extended, but the operation becomes unsafe due to imprecise control
Solution Approach 1:
The actuator system incorporates feedback mechanisms that continuously monitor the mast's position and extension state. This feedback enables precise control of the mast movement, ensuring it stops at predetermined positions and prevents over-extension. The system can detect and respond to abnormal conditions, significantly improving operational safety compared to imprecise hoist systems.
Data Source
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AI summary
This dismantling system (1) for a nuclear installation comprises a fixed part (2), configured to be connected to the nuclear installation, a mast (4) supported by the fixed part and extending downwards along a vertical axis from the fixed part, the mast having at least two modules (41, 43) assembled together, a tool (8), carried by the lowest module (41) of the mast, and a handling system (6), adapted to add an additional module (43) to the top of the mast and then lower the mast, so as to lengthen the mast, and to raise and then remove the highest module (43) of the mast, so as to shorten the mast. The handling system comprises a lifting beam intended to be attached to the highest module of the mast, and two actuators on which the lifting beam is intended to rest. The deployment of the actuators causes the lifting beam to move between an upper and a lower position.